[libdazzle] suggestion: allow wrapping when no selection is active

[Christian Hergert <chergert src gnome org>]

commit 31af551e97fcb7e248e7740d7c7e1d59ae9807cb
Author: Christian Hergert <chergert redhat com>
Date:   Mon Jan 21 10:48:49 2019 -0800

    suggestion: allow wrapping when no selection is active
    
    Pressing Up while no selection is active will jump to the last row.

 src/suggestions/dzl-suggestion-popover.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)
---
diff --git a/src/suggestions/dzl-suggestion-popover.c b/src/suggestions/dzl-suggestion-popover.c
index 06f259e..a2b92f2 100644
--- a/src/suggestions/dzl-suggestion-popover.c
+++ b/src/suggestions/dzl-suggestion-popover.c
@@ -949,11 +949,19 @@ dzl_suggestion_popover_move_by (DzlSuggestionPopover *self,
 
   g_return_if_fail (DZL_IS_SUGGESTION_POPOVER (self));
 
-  if (NULL == (row = gtk_list_box_get_row_at_index (GTK_LIST_BOX (self->list_box), 0)))
+  if (!(row = gtk_list_box_get_row_at_index (GTK_LIST_BOX (self->list_box), 0)))
     return;
 
-  if (NULL == gtk_list_box_get_selected_row (GTK_LIST_BOX (self->list_box)))
+  if (!gtk_list_box_get_selected_row (GTK_LIST_BOX (self->list_box)))
     {
+      if (amount < 0)
+        {
+          guint n_items = g_list_model_get_n_items (self->model);
+
+          if (n_items > 0)
+            row = gtk_list_box_get_row_at_index (GTK_LIST_BOX (self->list_box), n_items - 1);
+        }
+
       dzl_suggestion_popover_select_row (self, row);
       return;
     }